JPH0732358A - Preparation of smc - Google Patents

Abstract

PURPOSE:To reduce a material loss by preparing SMC(sheet molding compound) with excellent productivity in a process of one stage. CONSTITUTION:While a long film l is sent continuously, an SMC material is supplied onto the film 1. While a long base material 2 is sent continuously, besides, it is superposed on the SMC material on the film 1 so that the SMC material be sandwiched between the film 1 and the base material 2. While this sandwich material 3 is sent continuously, next, it is passed through a maturing furnace 4 so that the SMC material be heated and matured. Then, this sandwich material 3 is cut in a prescribed size, while it is sent continuously. Since the SMC material is passed through the maturing furnace 4 and matured in the state of being sandwiched between the film 1 and the base material 2, it is unnecessary to provide a maturing process as another process and, besides, a process of renewing the base material 2 is also dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing SMC used for molding FRP and the like.

[0002]

2. Description of the Related Art SMC (sheet molding compound) is manufactured as shown in FIG. FIG. 4A shows a molding material applying step,
A long film 1 made of polypropylene or the like is continuously fed out and fed, a molding material 12 of a thermosetting resin is supplied on the film 1 by a dip tank 11, and glass fibers 14 obtained by cutting a glass roving 13 are scattered, Further, another long film 15 such as polypropylene is continuously fed out and fed, and the film 15 is overlaid on the SMC material composed of the molding material 12 and the glass fiber 14 on the film 1, and these are further continuous. By passing it between a pair of upper and lower net conveyors 16 while sending
Sandwich C material between films 1 and 15. Then, the sandwich 17 is continuously fed and wound up on a roll as an SMC original fabric 18.

Next, the original SMC roll 1 wound on this roll
8 is placed on an aging table 19 and placed in an aging chamber 20 at about 40 ° C. for heating as shown in the aging step of FIG. 4 (b) for several days (3 days ± 0.5 days). Let it thicken. FIG. 4 (c) shows a replacement cutting process, in which the film 15 on one side of the SMC original fabric 18 is FRP-processed.
This is a process for replacing the non-woven fabric, paper, cloth, etc. required by the user with the substrate 2 desired by the user. In this step, the SMC raw fabric 18 aged as described above is continuously fed while being unrolled from the roll, and the film 15 on one side is peeled off and wound up. On the other hand, while continuously feeding the long base material 2, the base material 2 is superposed on the SMC material exposed by peeling off the film 15 of the SMC original fabric 18, and this is passed between the sticking rolls 21 and 21. By SMC original 1
The SMC product can be obtained by pasting the base material 2 on 8 and cutting it to a predetermined size by a cutter 22 such as a shear cutter while feeding it continuously.

[0004]

However, the method shown in FIG. 4 requires three steps, namely, once the SMC raw fabric 18 is manufactured, then the SMC raw fabric 18 is aged in the aging chamber 20 and the base material 2 is replaced. However, there is a problem in productivity, and in addition, since one film 15 of the two films 1 and 15 is discarded, there is a problem that a material loss is large.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a method for manufacturing SMC which can be manufactured with high productivity in a single step and has a small material loss. Is.

[0006]

According to the method for producing SMC of the present invention, the SMC material is supplied to the film 1 while continuously feeding the long film 1, and the long substrate 2 is continuously supplied. While sending, superimpose on SMC material on film 1 and SM
Sandwich C material between film 1 and substrate 2,
Next, the maturing furnace 4 is fed while continuously feeding the sandwich 3
It is characterized in that the SMC material is aged by heating through the above, and the sandwich 3 is continuously fed and cut into a predetermined size.

In the present invention, the aging furnace 4 is divided into a temperature rising zone 4a, a heating zone 4b and a cooling zone 4c from the inlet side to the outlet side.

[0008]

Since the SMC material is sandwiched between the film 1 and the base material 2 and passed through the aging furnace 4 to ripen the SMC material, there is no need to provide another aging step, and The step of replacing the base material 2 is also unnecessary.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. Figure 1
Shows an example of an apparatus used in the present invention. First, a film 1 such as a long polypropylene film wound on a roll is continuously fed by a feed roll 25 and fed to a coating device 24 so that the film 1 is placed on the film 1. The molding material 12 is supplied and applied. As the molding material 12, thermosetting resin molding materials such as phenol resin, melamine resin and unsaturated polyester resin used for FRP can be used, and in consideration of speeding up the line, immediate curing material. It is preferable to select, and in addition to the resin, a mixture of calcium carbonate, aluminum hydroxide, a filler such as Aerosil, or a pigment can be used.

The coating device 24 is used to apply the viscosity of the molding material 12 to be coated.
It can be selected according to the degree and application amount (unit weight)
However, in the embodiment of FIG. 1, the film 1 as shown in FIG.
Sending back-up roll 26, bank plate 27, dock
Using the one formed with the tar roll 28
There is a molding material between the bank plate 27 and the doctor roll 28
The charge 12 is supplied. With this one,
When sending the film 1 with the cue roll 26
Of the doctor piece 28a on the outer periphery of the roll 28 to a predetermined thickness
Which can be applied to the film 1
It Further, after the molding material 12 is applied, it is continuously fed.
A fiber cutting and spreading machine 29 is arranged above the film 1.
Glass fiber obtained by cutting the glass roving 13
Spray the fiber 14 onto the molding material 12 with the film 1 applied.
I am doing it. For example, the viscosity of the molding material 12 is
Using the one of 5000cps, the coating unit 24
00 g / m²Applying to the extent and fiber cutting spreader 29
Glass fiber 14 at 50 g / m ²Disperse in a certain amount
150g / m²About SMC material
It can be supplied to the film 1.

After the SMC material composed of the molding material 12 and the glass fiber 14 is supplied onto the film 1 in this way, the long base material 2 such as a long non-woven fabric or paper or cloth wound on a roll is continuously fed out. While stacking on the SMC material on the film 1 by the stacking roll 31, the SMC material is passed between the upper and lower net conveyors 16 while continuously feeding the SMC material between the film 1 and the base material 2. Make a sandwich. Then, the sandwich 3 is continuously fed and passed through the aging furnace 4 to age the SMC material.

As the aging furnace 4, for example, a hot air dryer as shown in FIG. 3 can be used, and a heating zone 4a and a heating zone 4b from the inlet 32 side to the outlet 33 side.
And is divided into cooling zones 4c. The temperature of the temperature raising zone 4a is about 40 to 50 ° C, and the temperature of the heating zone 4b is 6 ° C.
The temperature of the cooling zone 4c is about 20 to 30 ° C.
The temperature is set to 0 ° C., and the heating zone 4a to the heating zone 4b
The SMC material is aged to be heated to increase its viscosity. By using a heat-resistant film such as polypropylene as the film 1, aging can be performed at a high temperature of about 60 to 80 ° C. In the aging furnace 4, the sandwich 3 has its lower surface (the surface on the side of the film 1) supporting rolls 34.
It is designed to be sent continuously while being supported by.

Here, as in the case of FIG. 4, when it is wound on a roll and aged, it takes a long time for aging because the heat conduction to the inside is poor, but when it is sent in a sheet form as shown in FIG. Since the heat conductivity is good, the sandwich 3 can be aged by continuously passing it through the aging furnace 4, and the aging temperature is 60-80.
The aging time can be shortened by setting the temperature as high as about ° C. In particular, when forming a thin material with the supply amount of the SMC material of about 150 g / m ² as described above (a basis weight of 500 g / m ² or less, a thickness of 200 to 300).
μ, glass content 20 to 40%), and aging in the aging furnace 4 becomes easy. For example, when the feeding speed is 6 m / min, the aging can be performed by setting the residence time in the aging furnace 4 to about 4 minutes. Further, since the cooling zone 4c is formed in the aging furnace 4 near the outlet 33, it is easy to control the aging state by stopping the reaction of the SMC material. When the aging is performed by continuously passing through the aging furnace 4 in this manner, the heating conditions for the SMC material become constant, so that the aging degree becomes stable and the defect rate can be zero. It will be.

After aging the SMC material in the aging furnace 4 in this manner, the sandwich 3 is further continuously fed to pass through the accumulator 35 and further cut into a predetermined size by a cutter 22 such as a shear cutter. The SMC product can be obtained by

[0015]

As described above, according to the present invention, the SMC material is supplied to the film while continuously feeding the long film, and the SM on the film is fed while continuously feeding the long substrate.
The SMC material is sandwiched between the film and the substrate overlaid on the C material, and then the SMC material is heated and aged through the aging furnace while continuously feeding the sandwich material, and the sandwich material is further continuous. Since the SMC material is cut into a predetermined size while being fed, the SMC material can be aged by passing it through a maturing furnace while sandwiching the SMC material between the film and the base material, and a maturing step is provided as a separate step. It eliminates the need for it and eliminates the step of reattaching the base material, and can be manufactured with high productivity in a one-step process. This eliminates the need to dispose of materials and reduces material loss.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of an apparatus used in the present invention.

FIG. 2 is a schematic view of a coating device in the same device.

FIG. 3 is a schematic cross-sectional view of a maturing furnace in the above-mentioned apparatus.

4A and 4B show an example of an apparatus used in a conventional example, in which FIG. 4A is a schematic diagram of a molding material applying step, FIG. 4B is a schematic diagram of an aging step, and FIG. It is a figure.

[Explanation of symbols]

 1 Film 2 Substrate 3 Sandwich 4 Aging furnace

Claims (2)

[Claims] 1. An SMC material is supplied to a film while continuously feeding a long film, and an SMC material is superposed on the SMC material on the film while continuously feeding a long base material. And then sandwiched between them and then sent through the maturing furnace while continuously feeding this sandwich.
A method for producing an SMC, which comprises heating a material C to be aged and further cutting the sandwich material while continuously feeding the sandwich material. 2. The SM according to claim 1, wherein the aging furnace is divided into a temperature rising zone, a heating zone, and a cooling zone from the inlet side to the outlet side of the aging furnace.
Manufacturing method of C.